Explosions, on fire Oct 13 1982 off Cape Kaliakra
Fire extinguished later same day
Taken in tow, broke in two, sank Oct 14 abt 30-40 miles east of Cape Emine.
Two crew dead

source

HOOKE

type

C

volume

material

dead

2

link

While en route from Constantza to Egypt in ballast,
explosions and fire ripped through the Nos. 3 and 4 tanks
of the 163,647 dwt Romanian motor tanker Unirea
on October 13, 1982
when in the Black Sea off Cape Kaliakra, Bulgaria.
Two of her crew died as a result.
A helicopter picked up one survivor from the sea
while the remaining survivors were located in lifeboats
by another Romanian vessel.
The fire raged for 10 hours before being extinguished
with tug assistance,
after which the badly damaged vessel was taken in tow for Constantza,
but she broke in two and sank about 35 miles east of Cape Emine on October 14.

source

CTX

type

C

volume

material

dead

2

link

Very likely tank cleaning, but we need confirmation.
Hard to believe a 1979 built Suezmax was not inerted,
but IMO did not require IGS until 1984,
and a Romanian flag ship probably never intended
to trade to the US.
(The USCG required IG in 1975 for tankers > 100,000 dwt.)